<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    div{
      width: 400px;
      height: 400px;
      border: 1px solid black;
      background: url("../../../images/bg-lt.png")  no-repeat left top,
                  url("../../../images/bg-rt.png") no-repeat right top;
    }
  </style>
</head>
<body>
<div>

</div>
</body>
</html>